Enhanced flotation of coal gasification fine slag based on ultrasonic pretreatment pulp and composite collector

Coal gasification fine slag (CGFS) is a kind of solid waste produced in the coal gasification process, in which residual carbon severely restricts its resource utilization. In this study, residual carbon is enriched from CGFS by a combined flotation process of ultrasonic pretreatment pulp connecting composite collectors. Compared to conventional flotation, the products quality is greatly upgraded, and the concentrates yield is significantly increased by this combined reinforcing process under the same reagent dosage. The combined process can simultaneously improve the structural characteristics and surface chemical properties of the CGFS. Ultrasonic pretreatment pulp shows excellent crushing effect on the closely connected carbon-ash particles. Moreover, the directional adsorption of composite collector on the CGFS surface greatly enhances CGFS floatability. The research results demonstrate that this combined process shows good adaptability to the reinforcement of different CGFS flotation, and it has potential industrial application prospects.